By one page experience, I mean that I want the navigation and posts (on the right) to stay in place when a user clicks from one navigation item to another.

The way I see it, it would be: the user clicks on a link in the navigation. The content of that page slides up from the bottom and appears between the navigation on the left and the post list on the right.

hi, now I have understood what your mean. after doing some experiments of hacking code with your idea, it seem works but with some drawback: it’s difficult to let the gallery post working properly;the background slider will be restarted when click a post link;and the responsive view will be broken.
so, if you don’t mind above drawbacks please leaving you site url here, I will let you known how to hacking the code later,
Best

Hi, I can not accesse the url you supplied. please customized the theme code reference attached file. change style.css reference rfr-style.css.jpg; change js/main.js file reference rfr-main.js.*.jpg with number order in images name.
Best